The spectral and spatial quality of the fused image is measured using five standard metrics [1]}—root mean squared error (RMSE), erreur relative globale adimensionnelle de synthese (ERGAS), spectral angle mapper (SAM), universal image quality index (UIQI), peak signal-to-noise ratio (PSNR) and structural similarity index measure (SSIM) [1]}, [3]}. Small values of ERGAS, SAM, and RMSE and large values of UIQI, PSNR, and SSIM signify better fusion quality.
